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YubiKey - The YubiKey is a one-time password device for secure login with two-factor authentication
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
SoloKeys - Secure login made open and easy 🔒
Myki Authenticator - Login to any account on any device with your fingerprint
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.